In Sri Lanka, the perch is a widely used unit of measurement, particularly for land area. It is part of the old British imperial system and remains common in real estate and land transactions in the country.

1 perch = 25 square meters or 272.25 square feet.

Additionally:

•40 perches = 1 rood

•160 perches = 1 acre

This system coexists with the metric system, which is officially adopted in Sri Lanka, but many people still use perches informally when dealing with property.